Watlow CLS200 - Manual (Page 169)

Doc.# 0600-3050-2000 Watlow Anafaze 153
8
Tuning and Control
This chapter describes the different methods of control
available with the CLS200. This chapter covers control al-
gorithms, control methods, PID control, starting PID val-
ues and tuning instructions to help appropriately set
control parameters in the CLS200 system. For more infor-
mation on PID control, consult the Watlow Anafaze Practi-
cal Guide to PID.
Control Algorithms
This section explains the algorithms available for control-
ling a loop.
The control algorithm dictates how the controller responds
to an input signal. Do not confuse control algorithms with
control output signals (for example, analog or pulsed dc
voltage). There are several control algorithms available:
• On/off
• Proportional (P)
• Proportional and integral (PI)
• Proportional with derivative (PD)
• Proportional with integral and derivative (PID)
P, PI or PID control is necessary when process variable cy-
cling is unacceptable or if the load or setpoint varies.
NOTE! For any of these control statuses to function,
the loop must be in automatic mode.